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March 5th, 2009, 22:25 | #1 |
Supressor filling
I am making a supressor for a NBB gun that i'm running on propane and was wondering what is a good filling to muffle the report. I figured I would post it here cuz it doesnt really fit into any of the other forums.
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March 5th, 2009, 22:31 | #2 |
Foam. Or foam-ish like material with lots of holes/airspace.
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March 5th, 2009, 22:39 | #3 |
here i just took a pic of the inside of my supressor its soft foam
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March 5th, 2009, 23:55 | #4 |
Depending on how well you want it to work, the filling to use will depend on the sound absorbent material's NRC and what frequencies you want to remove. The suppressor's internal volume will be a major deciding factor in how much can be used and also in determining the volume's Fs (resonant frequency) and second high order Fs. The suppressor will also amplify these sounds and can defeat the purpose, partial reason to why most are not super effective.
Last edited by arcanuck; March 6th, 2009 at 00:21.. |
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March 6th, 2009, 00:02 | #5 |
Cough cough. Manufacturing certain devices....
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ಠ_ಠLess QQ more Pew Pew READY TO >> RACE |
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March 6th, 2009, 00:21 | #6 | |
Official ASC Bladesmith
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Quote:
Do what I do, get copper pipe foam insulation from a hardware store, cut into 1/2" slices, then take half of them and cut the thickness down to 1/4" or so. Alternate the slices, thick and thin, this creates foam baffles within the suppressor. Cut each to the right size to fit snugly (after expanded) into the tube, and use a barrel or a rod to press all into the outer shell of the suppressor. Literally what you want is vertical surfaces for the gas and the report to hit, isn't so much just open cell foam to absorb it, you need to have obstructions. |
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March 6th, 2009, 01:05 | #7 | |
Quote:
Again the lack of design knowledge and how to implement it properly keeps individuals from being successful in adequate attenuation, but that is a good thing I suppose since we don't want people building real ones either. So I guess if someone wants to change the sound and maybe lower the report a bit, foam will work. Last edited by arcanuck; March 6th, 2009 at 01:38.. |
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March 6th, 2009, 11:13 | #8 |
Should I pack the filling tight? Or leave it loose with extra airspace? Or fill up all the space, without squishing anything?
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March 6th, 2009, 11:35 | #9 | |
Official ASC Bladesmith
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Tight enough to stay in place and not shift, loose enough to not have it get pressed into the BB's path.
Quote:
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March 6th, 2009, 11:44 | #10 |
Le Roi des poissons d'avril
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cough cough... not real steel... cough... would by silly to try for real steel... cough...
I'm off getting cough sirup.
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Vérificateur d'âge: Terrebonne |
March 6th, 2009, 11:52 | #11 |
Tys
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3M scrub pads
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